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Subject[PATCH V4 1/6] net: lorawan: Add LoRaWAN socket module
Date
This patch adds a new address/protocol family for LoRaWAN network.
It also implements the the functions and maps to Datagram socket for
LoRaWAN unconfirmed data messages.

Signed-off-by: Jian-Hong Pan <starnight@g.ncu.edu.tw>
---
V2:
- Split the LoRaWAN class module patch in V1 into LoRaWAN socket and
LoRaWAN Soft MAC modules
- Add lorawan_netdev.h header file for network address related
declaration
- Use SPDX license identifiers

V3:
- Change the inline functions to a single line macro or just remove the
decoration word - inline
- Order local variables from longest to shortest line in the functions
- Change mac_cb inline function to lrw_get_mac_cb macro

V4:
- Change lrw_get_mac_cb macro to an inline function
- Use pr_fmt() instead of defining new printing log macros
- Fix by coding style report from scripts/checkpatch.pl

include/linux/lora/lorawan_netdev.h | 52 +++
net/lorawan/Kconfig | 10 +
net/lorawan/Makefile | 2 +
net/lorawan/socket.c | 686 ++++++++++++++++++++++++++++
4 files changed, 750 insertions(+)
create mode 100644 include/linux/lora/lorawan_netdev.h
create mode 100644 net/lorawan/Kconfig
create mode 100644 net/lorawan/Makefile
create mode 100644 net/lorawan/socket.c

diff --git a/include/linux/lora/lorawan_netdev.h b/include/linux/lora/lorawan_netdev.h
new file mode 100644
index 000000000000..5bffb5164f95
--- /dev/null
+++ b/include/linux/lora/lorawan_netdev.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
+/*-
+ * LoRaWAN stack related definitions
+ *
+ * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
+ *
+ */
+
+#ifndef __LORAWAN_NET_DEVICE_H__
+#define __LORAWAN_NET_DEVICE_H__
+
+enum {
+ LRW_ADDR_APPEUI,
+ LRW_ADDR_DEVEUI,
+ LRW_ADDR_DEVADDR,
+};
+
+struct lrw_addr_in {
+ int addr_type;
+ union {
+ u64 app_eui;
+ u64 dev_eui;
+ u32 devaddr;
+ };
+};
+
+struct sockaddr_lorawan {
+ sa_family_t family; /* AF_LORAWAN */
+ struct lrw_addr_in addr_in;
+};
+
+/**
+ * lrw_mac_cb - This structure holds the control buffer (cb) of sk_buff
+ *
+ * @devaddr: the LoRaWAN device address of this LoRaWAN hardware
+ */
+struct lrw_mac_cb {
+ u32 devaddr;
+};
+
+/**
+ * lrw_get_mac_cb - Get the LoRaWAN MAC control buffer of the sk_buff
+ * @skb: the exchanging sk_buff
+ *
+ * Return: the pointer of LoRaWAN MAC control buffer
+ */
+static inline struct lrw_mac_cb *lrw_get_mac_cb(struct sk_buff *skb)
+{
+ return (struct lrw_mac_cb *)skb->cb;
+}
+
+#endif
diff --git a/net/lorawan/Kconfig b/net/lorawan/Kconfig
new file mode 100644
index 000000000000..bf6c9b77573b
--- /dev/null
+++ b/net/lorawan/Kconfig
@@ -0,0 +1,10 @@
+config LORAWAN
+ tristate "LoRaWAN Network support"
+ help
+ LoRaWAN defines low data rate, low power and long range wireless
+ wide area networks. It was designed to organize networks of automation
+ devices, such as sensors, switches and actuators. It can operate
+ multiple kilometers wide.
+
+ Say Y here to compile LoRaWAN support into the kernel or say M to
+ compile it as a module.
diff --git a/net/lorawan/Makefile b/net/lorawan/Makefile
new file mode 100644
index 000000000000..8c923ca6541a
--- /dev/null
+++ b/net/lorawan/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_LORAWAN) += lorawan.o
+lorawan-objs := socket.o
diff --git a/net/lorawan/socket.c b/net/lorawan/socket.c
new file mode 100644
index 000000000000..c1981ef5b067
--- /dev/null
+++ b/net/lorawan/socket.c
@@ -0,0 +1,686 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
+/*-
+ * LoRaWAN stack related definitions
+ *
+ * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
+ *
+ */
+
+#define LORAWAN_MODULE_NAME "lorawan"
+
+#define pr_fmt(fmt) LORAWAN_MODULE_NAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/net.h>
+#include <linux/if_arp.h>
+#include <linux/termios.h> /* For TIOCOUTQ/INQ */
+#include <net/sock.h>
+#include <linux/lora/lorawan_netdev.h>
+
+/**
+ * dgram_sock - This structure holds the states of Datagram socket
+ *
+ * @sk: network layer representation of the socket
+ * sk must be the first member of dgram_sock
+ * @src_devaddr: the LoRaWAN device address for this connection
+ * @bound: this socket is bound or not
+ * @connected: this socket is connected to the destination or not
+ * @want_ack: this socket needs to ack for the connection or not
+ */
+struct dgram_sock {
+ struct sock sk;
+ u32 src_devaddr;
+
+ u8 bound:1;
+ u8 connected:1;
+};
+
+static HLIST_HEAD(dgram_head);
+static DEFINE_RWLOCK(dgram_lock);
+
+static struct dgram_sock *
+dgram_sk(const struct sock *sk)
+{
+ return container_of(sk, struct dgram_sock, sk);
+}
+
+static struct net_device *
+lrw_get_dev_by_addr(struct net *net, u32 devaddr)
+{
+ __be32 be_addr = cpu_to_be32(devaddr);
+ struct net_device *ndev = NULL;
+
+ rcu_read_lock();
+ ndev = dev_getbyhwaddr_rcu(net, ARPHRD_LORAWAN, (char *)&be_addr);
+ if (ndev)
+ dev_hold(ndev);
+ rcu_read_unlock();
+
+ return ndev;
+}
+
+static int
+dgram_init(struct sock *sk)
+{
+ return 0;
+}
+
+static void
+dgram_close(struct sock *sk, long timeout)
+{
+ sk_common_release(sk);
+}
+
+static int
+dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
+{
+ struct sockaddr_lorawan *addr = (struct sockaddr_lorawan *)uaddr;
+ struct dgram_sock *ro = dgram_sk(sk);
+ struct net_device *ndev;
+ int ret;
+
+ lock_sock(sk);
+ ro->bound = 0;
+
+ ret = -EINVAL;
+ if (len < sizeof(*addr))
+ goto dgram_bind_end;
+
+ if (addr->family != AF_LORAWAN)
+ goto dgram_bind_end;
+
+ if (addr->addr_in.addr_type != LRW_ADDR_DEVADDR)
+ goto dgram_bind_end;
+
+ pr_debug("%s: bind address %X\n", __func__, addr->addr_in.devaddr);
+ ndev = lrw_get_dev_by_addr(sock_net(sk), addr->addr_in.devaddr);
+ if (!ndev) {
+ ret = -ENODEV;
+ goto dgram_bind_end;
+ }
+ netdev_dbg(ndev, "%s: get ndev\n", __func__);
+
+ if (ndev->type != ARPHRD_LORAWAN) {
+ ret = -ENODEV;
+ goto dgram_bind_end;
+ }
+
+ ro->src_devaddr = addr->addr_in.devaddr;
+ ro->bound = 1;
+ ret = 0;
+ dev_put(ndev);
+ pr_debug("%s: bound address %X\n", __func__, ro->src_devaddr);
+
+dgram_bind_end:
+ release_sock(sk);
+ return ret;
+}
+
+static int
+lrw_dev_hard_header(struct sk_buff *skb, struct net_device *ndev,
+ const u32 src_devaddr, size_t len)
+{
+ /* TODO: Prepare the LoRaWAN sending header here */
+ return 0;
+}
+
+static int
+dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
+{
+ struct dgram_sock *ro = dgram_sk(sk);
+ struct net_device *ndev;
+ struct sk_buff *skb;
+ size_t hlen;
+ size_t tlen;
+ int ret;
+
+ pr_debug("%s: going to send %zu bytes", __func__, size);
+ if (msg->msg_flags & MSG_OOB) {
+ pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
+ return -EOPNOTSUPP;
+ }
+
+ pr_debug("%s: check msg_name\n", __func__);
+ if (!ro->connected && !msg->msg_name)
+ return -EDESTADDRREQ;
+ else if (ro->connected && msg->msg_name)
+ return -EISCONN;
+
+ pr_debug("%s: check bound\n", __func__);
+ if (!ro->bound)
+ ndev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_LORAWAN);
+ else
+ ndev = lrw_get_dev_by_addr(sock_net(sk), ro->src_devaddr);
+
+ if (!ndev) {
+ pr_debug("no dev\n");
+ ret = -ENXIO;
+ goto dgram_sendmsg_end;
+ }
+
+ if (size > ndev->mtu) {
+ netdev_dbg(ndev, "size = %zu, mtu = %u\n", size, ndev->mtu);
+ ret = -EMSGSIZE;
+ goto dgram_sendmsg_end;
+ }
+
+ netdev_dbg(ndev, "%s: create skb\n", __func__);
+ hlen = LL_RESERVED_SPACE(ndev);
+ tlen = ndev->needed_tailroom;
+ skb = sock_alloc_send_skb(sk, hlen + tlen + size,
+ msg->msg_flags & MSG_DONTWAIT,
+ &ret);
+
+ if (!skb)
+ goto dgram_sendmsg_no_skb;
+
+ skb_reserve(skb, hlen);
+ skb_reset_network_header(skb);
+
+ ret = lrw_dev_hard_header(skb, ndev, 0, size);
+ if (ret < 0)
+ goto dgram_sendmsg_no_skb;
+
+ ret = memcpy_from_msg(skb_put(skb, size), msg, size);
+ if (ret > 0)
+ goto dgram_sendmsg_err_skb;
+
+ skb->dev = ndev;
+ skb->protocol = htons(ETH_P_LORAWAN);
+
+ netdev_dbg(ndev, "%s: push skb to xmit queue\n", __func__);
+ ret = dev_queue_xmit(skb);
+ if (ret > 0)
+ ret = net_xmit_errno(ret);
+ netdev_dbg(ndev, "%s: pushed skb to xmit queue with ret=%d\n",
+ __func__, ret);
+ dev_put(ndev);
+
+ return ret ?: size;
+
+dgram_sendmsg_err_skb:
+ kfree_skb(skb);
+dgram_sendmsg_no_skb:
+ dev_put(ndev);
+
+dgram_sendmsg_end:
+ return ret;
+}
+
+static int
+dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+ int noblock, int flags, int *addr_len)
+{
+ DECLARE_SOCKADDR(struct sockaddr_lorawan *, saddr, msg->msg_name);
+ struct sk_buff *skb;
+ size_t copied = 0;
+ int err;
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ goto dgram_recvmsg_end;
+
+ copied = skb->len;
+ if (len < copied) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ if (err)
+ goto dgram_recvmsg_done;
+
+ sock_recv_ts_and_drops(msg, sk, skb);
+ if (saddr) {
+ memset(saddr, 0, sizeof(*saddr));
+ saddr->family = AF_LORAWAN;
+ saddr->addr_in.devaddr = lrw_get_mac_cb(skb)->devaddr;
+ *addr_len = sizeof(*saddr);
+ }
+
+ if (flags & MSG_TRUNC)
+ copied = skb->len;
+
+dgram_recvmsg_done:
+ skb_free_datagram(sk, skb);
+
+dgram_recvmsg_end:
+ if (err)
+ return err;
+ return copied;
+}
+
+static int
+dgram_hash(struct sock *sk)
+{
+ pr_debug("%s\n", __func__);
+ write_lock_bh(&dgram_lock);
+ sk_add_node(sk, &dgram_head);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+ write_unlock_bh(&dgram_lock);
+
+ return 0;
+}
+
+static void
+dgram_unhash(struct sock *sk)
+{
+ pr_debug("%s\n", __func__);
+ write_lock_bh(&dgram_lock);
+ if (sk_del_node_init(sk))
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+ write_unlock_bh(&dgram_lock);
+}
+
+static int
+dgram_connect(struct sock *sk, struct sockaddr *uaddr, int len)
+{
+ struct dgram_sock *ro = dgram_sk(sk);
+
+ /* Nodes of LoRaWAN send data to a gateway only, then data is received
+ * and transferred to servers with the gateway's policy.
+ * So, the destination address is not used by nodes.
+ */
+ lock_sock(sk);
+ ro->connected = 1;
+ release_sock(sk);
+
+ return 0;
+}
+
+static int
+dgram_disconnect(struct sock *sk, int flags)
+{
+ struct dgram_sock *ro = dgram_sk(sk);
+
+ lock_sock(sk);
+ ro->connected = 0;
+ release_sock(sk);
+
+ return 0;
+}
+
+static int
+dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+ struct net_device *ndev = sk->sk_dst_cache->dev;
+ struct sk_buff *skb;
+ int amount;
+ int err;
+
+ netdev_dbg(ndev, "%s: ioctl file (cmd=0x%X)\n", __func__, cmd);
+ switch (cmd) {
+ case SIOCOUTQ:
+ amount = sk_wmem_alloc_get(sk);
+ err = put_user(amount, (int __user *)arg);
+ break;
+ case SIOCINQ:
+ amount = 0;
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ skb = skb_peek(&sk->sk_receive_queue);
+ if (skb) {
+ /* We will only return the amount of this packet
+ * since that is all that will be read.
+ */
+ amount = skb->len;
+ }
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ err = put_user(amount, (int __user *)arg);
+ break;
+ default:
+ err = -ENOIOCTLCMD;
+ }
+
+ return err;
+}
+
+static int
+dgram_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ int val, len;
+
+ if (level != SOL_LORAWAN)
+ return -EOPNOTSUPP;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ len = min_t(unsigned int, len, sizeof(int));
+
+ switch (optname) {
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+
+ if (copy_to_user(optval, &val, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int
+dgram_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ int val;
+ int err;
+
+ err = 0;
+
+ if (optlen < sizeof(int))
+ return -EINVAL;
+
+ if (get_user(val, (int __user *)optval))
+ return -EFAULT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+
+ return err;
+}
+
+static struct proto lrw_dgram_prot = {
+ .name = "LoRaWAN",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct dgram_sock),
+ .init = dgram_init,
+ .close = dgram_close,
+ .bind = dgram_bind,
+ .sendmsg = dgram_sendmsg,
+ .recvmsg = dgram_recvmsg,
+ .hash = dgram_hash,
+ .unhash = dgram_unhash,
+ .connect = dgram_connect,
+ .disconnect = dgram_disconnect,
+ .ioctl = dgram_ioctl,
+ .getsockopt = dgram_getsockopt,
+ .setsockopt = dgram_setsockopt,
+};
+
+static int
+lrw_sock_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (sk) {
+ sock->sk = NULL;
+ sk->sk_prot->close(sk, 0);
+ }
+
+ return 0;
+}
+
+static int
+lrw_sock_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_lorawan *addr = (struct sockaddr_lorawan *)uaddr;
+ struct sock *sk = sock->sk;
+
+ pr_debug("%s: bind address %X\n", __func__, addr->addr_in.devaddr);
+ if (sk->sk_prot->bind)
+ return sk->sk_prot->bind(sk, uaddr, addr_len);
+
+ return sock_no_bind(sock, uaddr, addr_len);
+}
+
+static int
+lrw_sock_connect(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len, int flags)
+{
+ struct sock *sk = sock->sk;
+
+ if (addr_len < sizeof(uaddr->sa_family))
+ return -EINVAL;
+
+ return sk->sk_prot->connect(sk, uaddr, addr_len);
+}
+
+static int
+lrw_ndev_ioctl(struct sock *sk, struct ifreq __user *arg, unsigned int cmd)
+{
+ struct net_device *ndev;
+ struct ifreq ifr;
+ int ret;
+
+ pr_debug("%s: cmd %ud\n", __func__, cmd);
+ ret = -ENOIOCTLCMD;
+
+ if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+ return -EFAULT;
+
+ ifr.ifr_name[IFNAMSIZ - 1] = 0;
+
+ dev_load(sock_net(sk), ifr.ifr_name);
+ ndev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
+
+ netdev_dbg(ndev, "%s: cmd %ud\n", __func__, cmd);
+ if (!ndev)
+ return -ENODEV;
+
+ if (ndev->type == ARPHRD_LORAWAN && ndev->netdev_ops->ndo_do_ioctl)
+ ret = ndev->netdev_ops->ndo_do_ioctl(ndev, &ifr, cmd);
+
+ if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+ ret = -EFAULT;
+ dev_put(ndev);
+
+ return ret;
+}
+
+static int
+lrw_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+
+ pr_debug("%s: cmd %ud\n", __func__, cmd);
+ switch (cmd) {
+ case SIOCGSTAMP:
+ return sock_get_timestamp(sk, (struct timeval __user *)arg);
+ case SIOCGSTAMPNS:
+ return sock_get_timestampns(sk, (struct timespec __user *)arg);
+ case SIOCOUTQ:
+ case SIOCINQ:
+ if (!sk->sk_prot->ioctl)
+ return -ENOIOCTLCMD;
+ return sk->sk_prot->ioctl(sk, cmd, arg);
+ default:
+ return lrw_ndev_ioctl(sk, (struct ifreq __user *)arg, cmd);
+ }
+}
+
+static int
+lrw_sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+
+ pr_debug("%s: going to send %zu bytes\n", __func__, len);
+ return sk->sk_prot->sendmsg(sk, msg, len);
+}
+
+static const struct proto_ops lrw_dgram_ops = {
+ .family = PF_LORAWAN,
+ .owner = THIS_MODULE,
+ .release = lrw_sock_release,
+ .bind = lrw_sock_bind,
+ .connect = lrw_sock_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = sock_no_getname,
+ .poll = datagram_poll,
+ .ioctl = lrw_sock_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = lrw_sock_sendmsg,
+ .recvmsg = sock_common_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+static int
+lorawan_creat(struct net *net, struct socket *sock, int protocol, int kern)
+{
+ struct sock *sk;
+ int ret;
+
+ if (!net_eq(net, &init_net))
+ return -EAFNOSUPPORT;
+
+ if (sock->type != SOCK_DGRAM)
+ return -EAFNOSUPPORT;
+
+ /* Allocates enough memory for dgram_sock whose first member is sk */
+ sk = sk_alloc(net, PF_LORAWAN, GFP_KERNEL, &lrw_dgram_prot, kern);
+ if (!sk)
+ return -ENOMEM;
+
+ sock->ops = &lrw_dgram_ops;
+ sock_init_data(sock, sk);
+ sk->sk_family = PF_LORAWAN;
+ sock_set_flag(sk, SOCK_ZAPPED);
+
+ if (sk->sk_prot->hash) {
+ ret = sk->sk_prot->hash(sk);
+ if (ret) {
+ sk_common_release(sk);
+ goto lorawan_creat_end;
+ }
+ }
+
+ if (sk->sk_prot->init) {
+ ret = sk->sk_prot->init(sk);
+ if (ret)
+ sk_common_release(sk);
+ }
+
+lorawan_creat_end:
+ return ret;
+}
+
+static const struct net_proto_family lorawan_family_ops = {
+ .owner = THIS_MODULE,
+ .family = PF_LORAWAN,
+ .create = lorawan_creat,
+};
+
+static int
+lrw_dgram_deliver(struct net_device *ndev, struct sk_buff *skb)
+{
+ struct dgram_sock *ro;
+ struct sock *sk;
+ bool found;
+ int ret;
+
+ ret = NET_RX_SUCCESS;
+ found = false;
+
+ read_lock(&dgram_lock);
+ sk_for_each(sk, &dgram_head) {
+ ro = dgram_sk(sk);
+ if (cpu_to_le32(ro->src_devaddr) == *(__le32 *)ndev->dev_addr) {
+ found = true;
+ break;
+ }
+ }
+ read_unlock(&dgram_lock);
+
+ if (!found)
+ goto lrw_dgram_deliver_err;
+
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ return NET_RX_DROP;
+
+ if (sock_queue_rcv_skb(sk, skb) < 0)
+ goto lrw_dgram_deliver_err;
+
+ return ret;
+
+lrw_dgram_deliver_err:
+ kfree_skb(skb);
+ ret = NET_RX_DROP;
+ return ret;
+}
+
+static int
+lorawan_rcv(struct sk_buff *skb, struct net_device *ndev,
+ struct packet_type *pt, struct net_device *orig_ndev)
+{
+ if (!netif_running(ndev))
+ goto lorawan_rcv_drop;
+
+ if (!net_eq(dev_net(ndev), &init_net))
+ goto lorawan_rcv_drop;
+
+ if (ndev->type != ARPHRD_LORAWAN)
+ goto lorawan_rcv_drop;
+
+ if (skb->pkt_type != PACKET_OTHERHOST)
+ return lrw_dgram_deliver(ndev, skb);
+
+lorawan_rcv_drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static struct packet_type lorawan_packet_type = {
+ .type = htons(ETH_P_LORAWAN),
+ .func = lorawan_rcv,
+};
+
+static int __init
+lrw_sock_init(void)
+{
+ int ret;
+
+ pr_info("module inserted\n");
+ ret = proto_register(&lrw_dgram_prot, 1);
+ if (ret)
+ goto lrw_sock_init_end;
+
+ /* Tell SOCKET that we are alive */
+ ret = sock_register(&lorawan_family_ops);
+ if (ret)
+ goto lrw_sock_init_err;
+
+ dev_add_pack(&lorawan_packet_type);
+ ret = 0;
+ goto lrw_sock_init_end;
+
+lrw_sock_init_err:
+ proto_unregister(&lrw_dgram_prot);
+
+lrw_sock_init_end:
+ return 0;
+}
+
+static void __exit
+lrw_sock_exit(void)
+{
+ dev_remove_pack(&lorawan_packet_type);
+ sock_unregister(PF_LORAWAN);
+ proto_unregister(&lrw_dgram_prot);
+ pr_info("module removed\n");
+}
+
+module_init(lrw_sock_init);
+module_exit(lrw_sock_exit);
+
+MODULE_AUTHOR("Jian-Hong Pan, <starnight@g.ncu.edu.tw>");
+MODULE_DESCRIPTION("LoRaWAN socket kernel module");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS_NETPROTO(PF_LORAWAN);
--
2.19.2
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